Glioma is a growth of cells that starts in the brain or spinal cord. The cells in a glioma look similar to healthy brain cells called glial cells. Glial cells surround nerve cells and help them function.

As a glioma grows it forms a mass of cells called a tumor. The tumor can grow to press on brain or spinal cord tissue and cause symptoms. Symptoms depend on which part of the brain or spinal cord is affected.

There are many types of glioma. Some grow slowly and aren't considered to be cancers. Others are considered cancerous. Another word for cancerous is malignant. Malignant gliomas grow quickly and can invade healthy brain tissue. Some types of glioma happen mostly in adults. Others happen mostly in kids.

The type of glioma you have helps your health care team understand how serious your condition is and what treatments might work best. In general, glioma treatment options include surgery, radiation therapy, chemotherapy and others.


Glioma symptoms depend on the location of the glioma. Symptoms also may depend on the type of glioma, its size and how quickly it's growing.

Common signs and symptoms of gliomas include:

  • Headache, particularly one that hurts the most in the morning.
  • Nausea and vomiting.
  • Confusion or a decline in brain function, such as problems with thinking and understanding information.
  • Memory loss.
  • Personality changes or irritability.
  • Vision problems, such as blurred vision, double vision or loss of peripheral vision.
  • Speech difficulties.
  • Seizures, especially in someone who hasn't had seizures before.

When to see a doctor

Make an appointment with your health care provider if you have any signs and symptoms that worry you.


Doctors aren't sure what causes glioma. It starts when cells in the brain or spinal cord develop changes in their DNA. A cell's DNA contains the instructions that tell a cell what to do.

The DNA changes tell the cells to make more cells quickly. The cells continue living when healthy cells would die. This causes too many cells that don't work right. The cells form a mass called a tumor.

The tumor can grow to press on nearby nerves and parts of the brain or spinal cord. This leads to glioma symptoms and can cause complications.

Some gliomas develop more changes in their DNA that cause them to become brain cancers. The changes tell the cells to invade and destroy healthy brain tissue.

In glioma, the tumor cells look similar to healthy brain cells called glial cells. The glial cells surround and support nerve cells in the brain and spinal cord.

Risk factors

Things that can increase the risk of glioma include:

  • Getting older. Gliomas are most common in adults between ages 45 and 65 years old. But glioma can happen at any age. Certain types of gliomas are more common in children and young adults.
  • Being exposed to radiation. People who have been exposed to a type of radiation called ionizing radiation have an increased risk of glioma. One example of ionizing radiation is radiation therapy used to treat cancer.
  • Having a family history of glioma. Glioma can run in families, but this is very rare. More research is needed to understand whether parents can pass a risk of glioma to their children.

Researchers haven't found anything you can do to prevent glioma.